package com.ithm.reggie.controller;

import com.ithm.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.UUID;

/**
 * 文件上传和下载
 */
@Slf4j
@RestController
@RequestMapping("/common")
public class CommonControal {
    @Value("${reggie.path}")
    private String basePath;

    /**
     * 文件上传
     *
     * @param file
     * @return
     */
    @PostMapping("/upload")
    public R<String> upload(MultipartFile file) {
        //file是一个临时文件，需要转存到指定位置，否则本次请求完成后临时文件会删除
        log.info("文件上传：{}", file.toString());

        //获取原始文件名
        String originalFilename = file.getOriginalFilename();
        String suffix = originalFilename.substring(originalFilename.lastIndexOf("."));
        String filename = UUID.randomUUID().toString() + suffix;

        File dir = new File(basePath);
        if (!dir.exists()) {
            dir.mkdirs();
        }
        try {
            file.transferTo(new File(basePath + filename));
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
        return R.success(filename);
    }

    /**
     * 文件下载
     */
    @GetMapping("/download")
    public void download(String name, HttpServletResponse response) {
        try {
            //输入流读取文件内容
            FileInputStream fileInputStream = new FileInputStream(new File(basePath+name));
            //输出流写浏览器
            ServletOutputStream outputStream = response.getOutputStream();

            response.setContentType("image/jpeg");
            int len = 0;
            byte bytes[] = new byte[1024];
            while ((len=fileInputStream.read(bytes))!=-1){
                outputStream.write(bytes,0,len);
                outputStream.flush();
            }

            fileInputStream.close();
            outputStream.close();
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }
}
